Commit 13077d80 authored by David S. Miller's avatar David S. Miller
Browse files

[SPARC64]: Export powerd facilities for external entities. 



Besides the existing usage for power-button interrupts, we'll
want to make use of this code for domain-services where the
LDOM manager can send reboot requests to the guest node.

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 2c4f4ecb

arch/sparc64/kernel/power.c

+31 −23
Original line number Diff line number Diff line 
/* $Id: power.c,v 1.10 2001/12/11 01:57:16 davem Exp $

 * power.c: Power management driver.

/* power.c: Power management driver.

 *

 * Copyright (C) 1999 David S. Miller (davem@redhat.com)

 * Copyright (C) 1999, 2007 David S. Miller (davem@davemloft.net)

 */



#include <linux/kernel.h>
@@ -19,6 +18,7 @@ 
#include <asm/prom.h>

#include <asm/of_device.h>

#include <asm/io.h>

#include <asm/power.h>

#include <asm/sstate.h>



#include <linux/unistd.h>
@@ -29,24 +29,26 @@ 
 */

int scons_pwroff = 1; 



#ifdef CONFIG_PCI

#include <linux/pci.h>

static void __iomem *power_reg;



static DECLARE_WAIT_QUEUE_HEAD(powerd_wait);

static int button_pressed;



static irqreturn_t power_handler(int irq, void *dev_id)

void wake_up_powerd(void)

{

	if (button_pressed == 0) {

		button_pressed = 1;

		wake_up(&powerd_wait);

	}

}



static irqreturn_t power_handler(int irq, void *dev_id)

{

	wake_up_powerd();



	/* FIXME: Check registers for status... */

	return IRQ_HANDLED;

}

#endif /* CONFIG_PCI */



extern void machine_halt(void);

extern void machine_alt_power_off(void);
@@ -56,27 +58,25 @@ void machine_power_off(void) 
{

	sstate_poweroff();

	if (!serial_console || scons_pwroff) {

#ifdef CONFIG_PCI

		if (power_reg) {

			/* Both register bits seem to have the

			 * same effect, so until I figure out

			 * what the difference is...

			 */

			writel(AUXIO_PCIO_CPWR_OFF | AUXIO_PCIO_SPWR_OFF, power_reg);

		} else

#endif /* CONFIG_PCI */

		} else {

			if (poweroff_method != NULL) {

				poweroff_method();

				/* not reached */

			}

		}

	}

	machine_halt();

}



void (*pm_power_off)(void) = machine_power_off;

EXPORT_SYMBOL(pm_power_off);



#ifdef CONFIG_PCI

static int powerd(void *__unused)

{

	static char *envp[] = { "HOME=/", "TERM=linux", "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL };
@@ -86,7 +86,7 @@ static int powerd(void *__unused) 
	daemonize("powerd");



	add_wait_queue(&powerd_wait, &wait);

again:



	for (;;) {

		set_task_state(current, TASK_INTERRUPTIBLE);

		if (button_pressed)
@@ -100,16 +100,28 @@ static int powerd(void *__unused) 
	/* Ok, down we go... */

	button_pressed = 0;

	if (kernel_execve("/sbin/shutdown", argv, envp) < 0) {

		printk("powerd: shutdown execution failed\n");

		add_wait_queue(&powerd_wait, &wait);

		goto again;

		printk(KERN_ERR "powerd: shutdown execution failed\n");

		machine_power_off();

	}

	return 0;

}



int start_powerd(void)

{

	int err;



	err = kernel_thread(powerd, NULL, CLONE_FS);

	if (err < 0)

		printk(KERN_ERR "power: Failed to start power daemon.\n");

	else

		printk(KERN_INFO "power: powerd running.\n");



	return err;

}



static int __init has_button_interrupt(unsigned int irq, struct device_node *dp)

{

	if (irq == PCI_IRQ_NONE)

	if (irq == 0xffffffff)

		return 0;

	if (!of_find_property(dp, "button", NULL))

		return 0;
@@ -130,17 +142,14 @@ static int __devinit power_probe(struct of_device *op, const struct of_device_id 
	poweroff_method = machine_halt;  /* able to use the standard halt */



	if (has_button_interrupt(irq, op->node)) {

		if (kernel_thread(powerd, NULL, CLONE_FS) < 0) {

			printk("Failed to start power daemon.\n");

		if (start_powerd() < 0)

			return 0;

		}

		printk("powerd running.\n");



		if (request_irq(irq,

				power_handler, 0, "power", NULL) < 0)

			printk("power: Error, cannot register IRQ handler.\n");

			printk(KERN_ERR "power: Cannot setup IRQ handler.\n");

	} else {

		printk("not using powerd.\n");

		printk(KERN_INFO "power: Not using powerd.\n");

	}



	return 0;
@@ -164,4 +173,3 @@ void __init power_init(void) 
	of_register_driver(&power_driver, &of_bus_type);

	return;

}
 
#endif /* CONFIG_PCI */

include/asm-sparc64/power.h

0 → 100644
+7 −0
Original line number Diff line number Diff line 
#ifndef _SPARC64_POWER_H

#define _SPARC64_POWER_H



extern void wake_up_powerd(void);

extern int start_powerd(void);



#endif /* !(_SPARC64_POWER_H) */